Sand distributor for filling molding boxes and the like with molding sand



June 28, 1932. w. SEIIDEMANN 1,865,145

SAND DISTRIBUTOR FOR FILLING MOLDING BOXES AND THE LIKE WITH HOLDING SAND Filed July 20, 1929 2 Sheets-Sheet 1 June 28, 1932. w. SEIDEMANN 1,865,145 SAND DISTRIBUTOR FOR FILLING MOLDING BOXES AND THE LIKE WITH HOLDING SAND Filed July 20, 1929 2 Sheets-Sheet 2 Patented June 28, 1932 smear forrice WILHELM SEIDEMAITN, OF DEESDEN, GERMANY SAND DISTRIBUTOR FOR FILLING MOLDING BOXES AND THE LIKE WITH MOLDING SAND Application filed July 20, 1929, Serial No. 379,626, and in Germany September, 1923.

This invention relates to a portable sand distributor for filling molding boxes, molding channels and the like with molding sand.

In metal foundries this operation is usually effected by hand labour, the sand being packed into the molding boxes or the like by hand ramming or by the use of compressedair rams.

The present invention provides an apparatus or machine which accomplishes the heretofore laborious and expensive method of filling and packing the molding boxes and the like in a much quicker and more eflicient manner.

The improved sand distributor is illus- 5 trated in the accompanying drawings to which reference is hereinafter made and whereon Fig. 1 is a vertical sectional view through the beater casing of the machine.

Fig. 2 is a plan view showing the beater casing and outlet connection in horizontal section and with the beater removed. In Fig. 2 the delivery pipe is shown attached to the machine.

Fig. 3 is a view at right angles to Fig. -1

in section through the beater casing and hopp Figs. at and 5 are views corresponding to Figs. -1 and 3 illustrating a modified construction.

i Fig. 6 is a plan view of the machine shown in Figs. 4 and 5 but showing the beater casing and outlet connection in horizontal section.

Fig. 7 is a detail sectional View of the delivery end of the delivery pipe.

' Fig. 8 is a sectional view on the hue 8-8 of Fi 7. I

Figs. 9 and 10 illustrate alternative forms of delivery nozzles.

and air under pressure may also be used as an auxiliary means of conveying the stream The apparatus comprises broadly a reof sand from the beater casing and for compacting it in the delivery pipe.

The beater may be driven either by means of a compressed air engine or turbine 15 as illustrated in Figs. 1,2 and 3 or by means of an electric motor24 as in Figs. 4-6. The exhaust from the compressed air engine or turbine 15 (Figs. 1-3) may be utilized to assist in conveyin the sand to the beater casings, the machine comprises a closed casing 1, a filling hopper 2 arranged alongside the casing shaft 3 driven by the compressed air engine 15. A stirring gear may be -fitted in the lower part of the hopper 2, the stirring gear preferably consisting of a shaft 5 and stirrers 6, a belt pulley being mounted on the shaft 5 which is supported in a bearing block or cover 8 which closes the lower part of the hopper. The delivery tube 9 is attached to an outlet aperture in the casing 1, the delivery tube 9 forming part of an ejector nozzle 35 to which is attached a hose coupling 10 for connection to a hosepipe 11 which is ,fittedwith a deliver. bend 12 and an outlet nozzle 13. The tur ine 15, beater casing 1 and hopper 2 are mounted on a frame supported on wheels 14. i

' The exhaust outlet 16 from the compressed air engine 15 delivers into a passage 17 a which .divides into a branch 18 leading to the ejector 35 and a branch 20 leading to a delivery jet orifice '31 at the bottom of the hopper 2. Air is supplied from a compressor to the rotary engine 15 at 21. Sand is filled into the hopper 2 and is fed from there to the casing 1 through an aperture 23 in the side of the easin 1.

Tn the alternative construction illustrated 1 and a fan or beater 4 on a transverse in Figs. 4-6 wherein an electric motor is employed, air under pressure from a separate air compressor is supplied to, an inlet 25 which communicates with a passage 26 leading to the ejector 35 and a branch passage 27 leads to the jet orifice 31 in the bottom of the hopper.

The beltpulley 7 may be driven from the compressed air engine or from the electric motor by gearing enclosed in a cover or casing 28.

A regulator 30 (Fig. 1) may be provided for controlling the supply of compressed air to the jet orifice 31. v

The stirring gear in the lower part of the hopper serves to loosen the molding sand and the air entering under pressure through the jet orifice 31 serves to blow the sand in the bottom of the hopper through the aperture23 into the beater casing 1. The stirrers 6 are preferably in the form of knives helically arranged on the shaft 5 and thus serve also to assist in conveying the sand from the hopper 2 to the casing 1. The passage 20 (Figs. 13) may be of rectangular section or the corresponding passage 27 (Figs. 4-6) may be of circular section but communicates with the jet orifice 31 through a curved passage 19 in the bearing block 8 and the jet orifice 31 is preferably of arcuate formation as shown in Figs. 1 and 4 so as to conform to the lower trough-shaped portion of the hopper 2. The fan or beater 4 is preferably double-armed as shown and provided with interchangeable blades 34 inclined rearwards in relation to the direction of rotation towards the periphery of the casing. The sand entering the casing through the aperture 23 is cut off or sliced by the blades 34, thereby ensuring a regular supply of sand to the delivery hose. The rearward inclination of the blades 34 gives an outward impulse to the sand cut off by the blades, thereby discharging the sand through the outlet tube 9, so that deliveryof the sand takes placecontinuously and it is found that with this construction the particles of sand are not carried round within the casing 1 by the beater or fan. Between the outlet tube 9 and the ejector casing 35 is an annular space 37 which surrounds the outlet tube 9 and communicates with the air passage 18 or 26, so that the air entering the hollow space 37 distributes itself around the tube 9 before passing out over the end of the latter and thus surrounds the oncoming sand, resulting in a smaller frictional resistance within the hose pipe 11 than if the sand came in direct contact with the inner wall of the hose pipe 11. The outlet tube 9 which carries the ejector casing 35 is hinged at 22 to the casing 1 and has a flange secured to the casing 1 by screws so that after loosening the fixing screws, the outlet tube 9 complete with 35 ejector casing 35 can be swung upwards for inspection or cleaning as indicated in dotted lines in Fig. 1. A cleaning or manhole cover 38 is also fitted to the casing 1.

In order to minimize noise the casing 1 is provided with an outer casing 40 between which are provided hollow spaces 41 filled with a suitable sound deadening composition. The manhole cover 38 may be similarly hollow and filled with sound deadening composition. The space 42 below the casing 1 is likewise filled with the sound deadening composition and closed by a plate 44. The spaces 41 around the casing 1 are closed by screw plugs 45, 46 and 47.

The outlet end of the delivery pipeis shown in detail in Figs. 7 and 8 and comprises a tapering bond 12, which preferably has a bend of and which is conncctedat one end to the hose pipe 11. To the other end of the bend 12 is attached another tapered bend 49, which is preferably a right angle bend and to which is detachably screwed the interchangeable nozzle 13. On the inside of the bends 12 and 49 are fitted hinged regulating flaps 50 and 51 which control air discharge slots 52 in the bends, which may be connected by a universal joint 53 so that the bend 49 may be rotated about the axis of the universal joint by means of a handle 55. The bend 12 is provided just in advance of the slots 52 with a tapering nose or projection 63 and the bend 49 is provided with a similar projection 64.

The separation of the air before the delivery of the sand is of great importance in sand delivering machines depending upon air feed, because efficient packing of the sand can only be attained with a sand supply which is practically free from air. If large quantities of air are present in the sand delivered, the sand does not settle in the mold and the air entrained in the sand breaks up the sand instead of compacting it.

In the apparatus according to the present invention, the mixture of sand and air passes through the pipe 11 first into the bend 12 where the heavier sand is thrown towards the outer wall of the bend and consequently the air which is lighter is separated out from the mixture at the inside of the bend. It will be noted that the bend 12 has a straight cylindrical portion and it is found that up to a certain point in the straight cylindrical portion, up to about the point 57, the sand and air are separated from one another and this enables the air under pressure to escape be efi'ected shortly before the delivery of the sand, so that the force with which the sand is delivered is not unduly diminished.

The further separation of air from sand takes place in-the bend 49 and owing to the sharper bend and the sharper taper Or the bend 49, more intensive air separation takes place in the bend 49 in front of the nose 64 therein. Complete separation of air is not desirable as a slight quantity or air is necessary from practical experience to suppl the sand to the outlet, this small quantity of air, however, is dissipated on the way between the delivery nozzle 13 and the delivery of the sand into the mold and thus causes no disaddvantageouseflect on the packing of the san The regulating flaps or valves 50 and 51 may be hinged and adjustably operated by hand pressure, so that the force of the current of sand can be regulated as desired.

, The apparatus does not require to be operated by a highly skilled workman. lhe delivery end of the pipe may be hung over the shoulders by the belt 58 so that the workman has his hands entirely freeand the apparatus can thus be operated by unskilled labour. With one hand on the handle an the operator rotates the bend 49 and with the other hand he can regulate the separation of the air and thus the force of the sand current by regulating the flaps 50 and 51.

Practical experiments have shown that sand does not escape through the slots 52 with the arrangement herein described.

The outer walls of the bends l2 and 49 are preferably made thicker than the inner walls owing to the greater wear that takes place on the outer walls through sand friction.

The nozzle 13 may be of any desired crosssection and shape, for example, round, oval, elongated or rectangular and examples of difierent nozzles are shown in Figs. 9 and 10. I claim v v 1-. Apparatus of the character described comprising a-receptacle for the material, an

ejector casing having an inlet aperture at its bottom and one side communicating with the lower part of said receptacle and having an outlet aperture atits bottom extending tangentially therefrom, a rotary ejector in said casing for discharging the material therefrom-through said outlet aperture, means for driving said ejector, a pneumatieejector nozzle communicating with said outlet aperture,

and means for supplying air under pressure simultaneously to said receptacle and to said nozzle. 1

2. Apparatus of the character described comprising a receptacle for thematerial, an ejector casing having an inlet aperture at its bottom and one side communicating with the lower part of said receptacle and having an outlet aperture at its bottom extending tangentially therefrom, a rotary ejector in said casing for discharging the material therefrom through said outlet aperture, means for driving said ejector, a pneumatic ejector nozzle communicating with said outlet aperture, and means for delivering a jet of air under pressure across thebottom of the receptacle toward the outlet aperture.

3. Apparatus or the character described comprising a receptacle, an ejectorcasing y having an inlet aperture communicating with the lower part of said receptacle, a rotary ejector in said casing having elements adapted to sweep across said aperture and an outlet connection from said casing, a compressed-air engine for driving said ejector, a pneumatic ejector nozzle communicating with said outlet connection, and passages connecting said receptacle and said nozzle with the engine exhaust. 4. Apparatus of the character described comprising a receptacle, an ejector casing having an inlet aperture communicating with the lower part of said receptacle,.a rotary ejector in said casing having elements adapted to sweep across said aperture and an outlet connection from said casing, a'compressed-air enginefor driving said ejector, a pneumatic ejector nozzle communicating with said outlet connection, a passage connecting said noz'zle with the engine exhaust, and a passage connecting the engine exhaust with a jet adapted to deliver air across the bottom of the receptacle towards the aperture communicating with the ejector casing.

zle communicating with said outlet aperture comprising a conical outlet tube leading from said outlet aperture and surrounded by a conical outer receiving nozzle to provide an annular tapering space between them, a discharge pipe connected to the receiving nozzle,

and means for supplying air under pressure to said tapering space.

6. Apparatus of the character described comprlsing a receptacle for the material, an ejector casing having an lnlet aperture at its bottom and one side communicating with the lower part of said receptacle and having an outlet aperture at its bottom extending tangentially therefrom, a rotary ejector in said casingfo-r discharging the material there-- from through said outlet aperture, means for 7 driving said ejector, a pneumatic ejector nozzle communicating with said outlet aperture, -means for supplylng air simultaneously 1111-,

der pressure to said receptacle and said nozzle, and means for hinging said nozzle to said casing to enable it to be swung-011 its hinge to obtain access to the outlet in the casing.

7 Apparatus of the character described comprising a receptacle for the material, an ejector casing having an inlet aperture atits bottom and one sidecommunicating with the lower part of said receptacle and having an outlet aperture at its bottom extending tangentially therefrom, a rotary ejector in said casing for discharging the material there from through said outlet aperture, means for driving said ejector, a delivery pipe attached to the outlet aperture, a hollow bend attached to the delivery pipe and having air discharge apertures on the inside of the bend, means for opening and closing said air discharge apertures, and a nozzle attached to said bend.

8. Apparatus of the character described comprising a receptacle for thematerial, an ejector casing having an inlet aperture at its bottom and one side communicating with the lower part of said receptacle and having an outlet aperture at its bottom extending tangentially therefrom, a rotary ejector in said casing for discharging the material therefrom through said outlet aperture, means for driving said ejector, a delivery pipe leading from the outlet aperture, a hollow bend attached to said delivery pipe and having air outlet apertures on the inside of the bend, a

. second hollow bend swivel attached to the first hollow bend and having similar air outlet apertures, means for opening and closing the apertures in said bends, a nozzle detachably connected to the second mentioned bend, and means for rotating the latter about its swivel attachment.

9. Apparatus of the character described comprising a receptacle for the material, an ejector casing having an inlet aperture at its bottom and one side communicating with the lower part of said receptacle and having an outlet aperture at its bottom extending tangentially therefrom, a rotary ejector in said casing for discharging the material there from through said outlet aperture, means for drivingsaid ejector, a delivery pipe leading from the outlet aperture, a hollow bend attached to said delivery pipe and having air outlet apertures on the inside of the bend, a second hollow bend swivel attached to the first hollow bend and having similar air outlet apertures, means for opening and closing the apertures in said bends, a nozzle detachably connected to the second mentioned bend, and means in said bends for deflecting the material away from the air outlet apertures.

10. Apparatus of the character described comprising a receptacle for the material, an

ejector casing having an inlet aperture at its bottom and one side communicating with the lower part of said receptacle and having an outlet aperture at its bottom extending tancharge apertures, a nozzle attached to said bend, and a projection in advance of the air outlet aperture and adjacent thereto for the purpose of deflecting material clear of the air outlet apertures.

11. An apparatus of the character described comprising a receptacle, an ejector casing arranged alongside said receptacle and having an inlet aperture at its base communicating with the base of said receptacle and having an outlet aperture at its base extending tangentially therefrom, a mechanical ejector in said casing arranged to sweep across said inlet and to discharge the material through said outlet, and means for supplying airunder pressure to the receptacle and to the outlet of the casing to agitate and feed the material.

12. An apparatus of the character described comprising a receptacle, an ejector casing arranged alongside said receptacle and having an inlet aperture communicating with the lower part of said receptacle and an outlet aperture extending tangentially therefrom, an ejector in said casing arranged to sweep across said inlet aperture and to discharge the material through the outlet aperture, a mechanical agitator and feeder in the receptacle, and means for supplying air under pressure to the receptacle and to the outlet aperture of the ejector casing to agitate the air and augment the feeding action.

13. An apparatus of the character described comprising a receptacle, an ejector casing having an inlet aperture communicating with the lower part of said receptacle and an outlet aperture extending tangentially therefrom, a rotary injector in said casing having elements adapted to sweep across said inlet aperture and to discharge the material through said outlet aperture, a pneumatic ejector nozzle communicating with said outlet aperture, and means for delivering blasts of air simultaneously to said pneumatic ejector nozzle and to the receptacle, and to cause the latter-named blasts to sweep across the bottom of the receptacle toward the inlet aperture of the ejector casing.

In testimony whereof I have signed my name to this specification on the 2nd day of July, 1929.

WILHELM SEIDEMANN. 

